Exhaust gas system unit

An exhaust gas sub-system for an internal combustion engine, comprising:

• a catalytic converter housing with an inlet section and with an inlet opening for introducing an exhaust gas flow into the catalytic converter housing and,
• for secondary gas, a feed line that is free of an exhaust gas flow, the feed line comprising an inflow element at its end, by means of which the secondary gas is fed to the exhaust gas flow,
• wherein the inflow element is placed upstream of the catalytic converter housing,
• wherein a heating element for heating the secondary gas is provided in the feed line upstream of the inflow element,
• wherein
• at least one inflow opening at the inlet section is correlated to the inflow element via which the heated secondary gas can be fed to the exhaust gas flow starting from the feed line,
• wherein the inflow element together with an outer side of the inlet section delimits a collection chamber from which the secondary gas can be guided into the inlet section via the inflow opening,
• wherein each inflow opening comprises an opening cross-section and an opening axis,
• wherein opening axes of adjacent inflow openings are inclined at an angle α to one another and thereby comprising different incident angles towards an exhaust gas main flow center axis.